I loved, with eMule and/or Kazaa (don't remember anymore which one), the feature of being able to get the list of all what the remote host was sharing => my idea was that if that person was sharing something that I liked, then that person might have other interesting stuff which I might have liked => from time to time that was the case.

1 or 2 years ago I installed it, connected to the network (nodes? meganodes? forgot the terminology), and activated somewhere the parameter to be verbose about the incoming search queries => A LOT of nasty porn stuff being searched (I therefore quickly shut down and uninstalled everything, brr) => it's a pity, but thinking about that later maybe they were just automated queries or similar submitted by police & Co. to search for illegal videos, who knows.